Furnace.



IVI. U. WIKSTROM.

FURNACE.

APPLICATION FILED MAR. r6. 1914.

Patented Feb; 27,1917..

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MALCOLM U. WIKSTEOM, OE CPIAELEROT, PENNSYLVANIA, AssieNoE To PiTTsBUneH STEEL PRODUCTS COMPANY, or PITTSBURGH, PENNSYLVANIA, A CORPORATION OP PENNSYLVANIA.

EUENAOE.

Patented Feb. 27, 1917'.

Application led March 16, 19'14. Serial No. 825,131.

To all whom t may concern.

Be it known that I, MALCOLM U. IVIKf sTnoM, a citizen of the United States, and resident of Charleroi, in the lcounty 'of Washington and State ,of Pennsylvania, have invented a new and useful Improvement in Furnaces, and I .do hereby declare the following to be a full, clear, and exact description thereof.

v"Ihis invention has reference to furnaces and mechanism for charging the metal into the same and withdrawing it therefrom.

In the manufacture of tubing for instance, and more ,especially seamless tubing, it is necessary ,to anneal the tubes after they have been drawn, and heretofore it has been customary to insert the tubes one by v011e into the annealing furnace through the door arranged at the end of same, and after the tubes have been annealed it was .customary to withdraw them vone at a ,time so that the operation of introducing and withdrawing the tubes required a great amount of labor and time, while at the same time the time that the door remained open during the charging of the furnace yand withdrawing of the tubes resulted in a great loss of heat. By my invention I propose to obvate all this by providing for the charging and withdrawing of a number of tubes at one time greatly reducing the labor and time heretofore required, and furthermore at a great saving in fuel.

In the accompanying drawings Figure 1 is a ,longitudinal lvertical section of Va furnace and 'with the charging apparatus Shown in dotted lines therein, and in full lines outside of said furnace; Fig. 2 is a sectional plan view of the furnace with the charging apparatus and the transfer mechanism in full lines; Fig. 3 is a .cross-section on the line 3-3 Fig, 2.

In the drawing the numeral l designates the foundation of a suitablev furnace with the sides 2 and 3 and the top 4. The furnace is provided with the frontl opening 5 which isA adaptedtobe closed by the door 6 which may beformed of a suitable casting with a refractory lining 7'. The door 6 is.

suspended by .it Suitable chain 8 connected up to any suitable mechanism (not shown) for raising and lowering the door.

One side of the furnace is provided with the apertures 9 arranged at intervals and said apertures are adapted to be closed by the doors 10 which are likewise formed of uitable castings with refractory linings 11. rFhese doors yare suspended by chains 12 which are connected with the counterweighted arms 13 and which act to raise the doors in their closed positions.

TWithin the furnace is the hearth 14; upon which the tubes or other articles to be an- Ilealed rest during the annealing process, and said hearth is provided with the grooves 15 which coincide with the apertures 9, and the bottoms of said grooves correspond with the bottoms of said apertures, for the reason more fully hereinafter set forth.

Arranged at intervals within the furnaces and resting-on the base 2 are the blocks 16 arranged at suitable intervalsapart, and .the upper corners vof said blocks are rounded off as at 17. These blocks may be formed of metal castings and form the support for the support or charging-table 18 which I will now .describe in .det-ail. This table consists of the .angle-bars 19 Vconnected by the cross-bars 20 said ,cross bars being formed of pairs of angles which combine to form .Z-bars, as clearly indicated in Fig. 1. rIhe ends of the angle-bars 1-9 are slightly turned inwardly as at 21 so as to avoid liability of the said angle-bars interfering with the movement of said charging-table. rIhe charging-table rests on the frame 22 infront of the furnace, and said frame is made .up of channel beams 22a connected together and upon which the angle-bars 19 rest.V

In the frame 22 is Vmounted the shaft 23 which is driven by the motor 24k and said shaft has the sprocket-wheel 25 with which the chain 26 engages. The chain 26 also passes around a sprocket-Wheel 27 at the forward en d of the frame 22. A hook 28 connected to the cross-bar 29 Of the charging table is adapted to engage the sprocket kchain 26, said hookbeing pivoted to said cross-bar 29 so that it can be thrown into and out of engagement with the sprocket chain 26. It is apparent that when the hook is in engagementwith the chain and power is applied to drive said chain that the charging-table will be moved along the frame`22 into the furnace when the .door 6 is raised, and the` tubes 30 depositedon 'said platform will be` carried into the furnace, the ,angleV bars 19 engaging the blocks 16 and restingthereon', as clearly indicated in Fig. 3i The position of the chargingtable when advanced into the furnace is indicated in dotted lines Fig. 1.

Extending parallel with the furnace are the tracks 31 on which the wheels 32 of the carriage 33 are adapted to travel. Power to drive the carriage 33 is obtained from the motor 34 which has the cog-wheel 35 meshing with the cog-wheel 36 on the driving axle 37.

The carriage 33 has the threaded sleeves 38 with which the vertical screw shafts 39 engage. The upper ends of the shafts 39 carry the beveled pinions 40 which are engaged by pinions 41 on the parallel shafts 42 and 42, Power is applied to drive one of the shafts 42 from the motor 43 which has the gear-wheel 44 meshing with the gearwheel 45 on the said shaft 42. Fower is communicated from the shaft 42 to the shaft 42a by the sprocket-chain 46, whereby the shafts 42 and 42"L are driven simultaneously, and consequently the vertical screw-shafts 39 are raised and lowered equally and simultaneously.

Lifting bars 47 rest on the idle-rollers 48 and the pinions 49 which engage the rackfaces 50 on the lower faces of said liftingbars, While the idle-rollers 50a bear on the upper faces of said lifting-bars and guide the same as they move back and forth. The reciprocating movement of the lifting-bars 47 is accomplished by the engagement of the pinions 49 with the racks 50 of said bars, and power is transmitted to the pinions 49 from the motor 51, a chain 52 connecting up the motor-shaft with the shaft 53 upon which the pinions 49 are mounted.

The lifting-bars 47 register with the apertures 9 in the sides of the furnaces and also with the grooves 15.

When a bundle of tubes to be annealed are conveyed by a crane into position over the charging-table 18 the tubes are lowered to the said table and when the bundling-chains are released the tubes will adjust themselves upon said table in parallel relation to each other', whereupon the door 6 is raised and power applied through the motor 24 to advance the charging-table into the furnace, the hook 28 having been thrown into engagement with the chain 26, which advances the said table into the furnace along the frame 22, and as the said table enters the furnace the angle-bars 19 engagethe blocks 16 and advance'over same until the table together with the pipes have been carried entirely into the furnace to the position indicated in dotted lines Fig. 1. The door 6 is then lowered. The carriage 33 is on the tracks 31 with the lifting bars 47 registering with the openings 39, whereupon the doors 10 are lifted, and said lifting bars having been previously adjusted to the proper height, the motor 51 is' put in operation and the pinions 49 feed the bars through the apertures 9 into the furnace, the bars passing below Athe tubes 30 and above the angle-bars 19 of the charging-table.

rIlhe motor 43 is then put in operation and through the connections described, the shafts 42 and 42a are rotated simultaneously which will turn'the screw-shafts 39 in the proper direction to lift the frame and the bars 49, whereupon the tubes 30 are lifted from the charging table to the position indicated in full lines Fig. 3. The door 6 of the furnace is then opened and the hook 28 thrown into engagement with the chain 26. The motor 24 is started and the chain .26 draws the charging-table out of the furnace, back onto the frame 22. The door 6 is instantly lowered and immediately the lifting-bars 47 are lowered through the operation of the motor 43 and the bars dropped down into the grooves 15 in the furnace hearth until the tubes rest on the hearth 14. rEhe liftingbars 47 are then withdrawn by the pinions 49, and the doors 10 close automatically. When the tubes have been properly annealed the doors 10 are again lifted and the liftingbars 47 advance into the grooves 15 below the tubes, and said lifting-bars are then raised until the tubes are again brought in position indicated in full lines Fig. 3. The door 6 is opened and the charging-table introduced into the furnace below the tubes whereupon th'eklifting-bars 47 are again lowered until the tubes rest upon said charging table. The lifting-bars are then withdrawn and the charging table is then drawn out of the furnace with the annealed tubes resting thereon.

The carriage 33 may be driven along the track and the same 'lifting means may be employed in connection with a number of furnaces arranged in line with each other.

While I have described my invention in connection with the annealing of tubes, 1 do not intend to limit it to this specific use, as it may be used for the annealing of rods or other metal shapes, and in fact may be applied to any kind of a furnace to which it may be found applicable.

`What 1 claim is:

1. The combination of a furnace, a longitudinally movable support for the metal adapted to move into and out of said furnace, and means introduced from the side of said furnace for receiving the metal from said. support while within the furnace.

2. The combination of a furnace, a longitudinally movable support for the metal adapted to be moved into and out of said furnace, and lifting means introduced in the side of the furnace, and adapted to pass under the metal on said support.

3. The combination of a furnace, a hearth, a longitudinally movable support for the metal adapted to be moved into and out of said furnace and lifting means introduced in the side of said furnace for lifting the metal from said hearth.

Li. The combination of the furnace, a movable-support for the metal adapted to be moved into and out of said furnace, a frame at the side of said furnace, liftingbars carried by said frame, said furnace having apertures for lifting-bars, and means carried by said frame for raising and lowering said bars.

5.The combination of the furnace, a movable-support for the metal` adapted to be moved into and out of said furnace, a frame at the side of said furnace, liftingbars carried by said frame, said furnace having openings for the entrance of said lifting-bars, means for raising and lowering said frame, and means for reciprocating said bars. Y

6. The combination of a furnace, a movable-support for the metal adapted to be moved into and out of said furnace, a vertically adjustable vframe at the side of said furnace, lifting-bars carried by said frame, said furnace having apertures for the entrance of said bars, racks on said bars, pinions on said frame engaging said racks, and mechanism for driving` said pinions.

7. The combination of a furnace, a movable-support fo-r the metal adapted to be moved into and out of said furnace, a frame at the side of said furnace having' threaded seats, screw-bars engaging said threaded seats, lifting-bars supported by said screwbars, means for reciprocating said liftingbars, and said furnace the introduction of said lifting-bars.

S. The combination of a furnace, a movable-support for the metall adapted to be the entrance of said having openings for l moved into and out of said furnace, a frame at the side of said furnace, lifting-bars carried by said frame, means for raising said lifting bars and for reciprocating same, said for the introducfurnace having openings counter-Weighted tion of said bars, and doors for saidopenings.

9. The combination of a furnace, a movable-support for the metal adapted to be moved into and out of said furnace, a carriage at the side of said furnace,-liftingbarsV supported by said carriage, said furnace having openings for the introduction of said lifting-bars, andmeans for raising and lowering said lifting-bars and for reciprocat'ing same.

10. The combination of a furnace, a movable-support for themetal adapted to be moved into and out of said furnace, a. furnace hearth having cross grooves formedl therein, said furnace having openings in the side registering With said grooves, and lifting-bars adapted to enter said openings and grooves.

11. rllhe combination of the furnace, a hearth, a movable-support for the metal, means for moving said support into and out of said furnace, a support above said hearth for said movable-support, and means for lifting the metal from -said movable-support. Y

In testimony ooLM U. IKSTRQM, hand.

whereof, I, the said MAL- have hereunto set my MALooLM U.l vviKsTRoM.

Witnesses: y I

Rorr. D. To'rTnN, 4 JOHN F. W'ILL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

